Aflatoxins are chemicals of fungal origin. They can contaminate food crops and have toxic effects on animals and people that eat them. Scientists have made breakthroughs in controlling them without GM.
Corn lines resist aflatoxins (September 2010)
Aflatoxin-resistant maize lines developed by US scientists (September 2010)
Non-GM technology reduces aflatoxins in maize in Nigeria (July/August 2007)